Table 2.
MIC and MBC of colistin against APEC strains.
| Potency | Colistin |
|---|---|
| Clinical isolates (n) | 89 |
| MIC (μg/mL) | |
| Range | 0.0156–2 |
| MIC50 | 0.25 |
| MIC90 | 0.5 |
| R (%) 1 | 0 |
| MBC (μg/mL) | |
| Range | 0.0156–2 |
| MBC50 | 0.25 |
| MBC90 | 0.5 |
| MBC/MIC | 1–2 |
| ATCC 25922 2 | |
| MIC (μg/mL) | 0.25 |
| MBC (μg/mL) | 0.25 |
| MBC/MIC | 1 |
1 R (%): Percentage of resistance in clinical isolates calculated using the breakpoint of colistin according to the CLSI, 2016 (susceptible, 2 μg/mL; intermediately resistant, 4 μg/mL; resistant, 8 μg/mL). 2 A control strain used.